Well it's a minor one so hopefully we can discover it as soon as the PTR is up and test it. I am fairly sure though it will make the gear more obvious, it fits transmogrification and it was often mentioned in priest feedback.

i always wanted my shadowpriest to have that look those guys in dragonblight had (the human casters with the crows or whatever flying around them), doubt that's it tho D:

I'd love this as well, but I suspect that that effect, especially if it was continuous, would add a large amount of clutter. Now, if it was a spell with a short duration, or a proc from something, that might work better.